[CH2:1]([N:3]1[C@@H:11]2[C:6]3=[C:7]([CH:20]=[C:21]([CH3:23])[CH:22]=[C:5]3[C@H:4]1[CH2:24][CH2:25][CH3:26])[C:8]1[C:15]([O:16][CH3:17])=[C:14]([O:18][CH3:19])[CH:13]=[CH:12][C:9]=1[CH2:10]2)[CH3:2].CCOCC>CC(C)=O>[CH2:1]([N:3]1[C@H:11]2[C:6]3=[C:7]([CH:20]=[C:21]([CH3:23])[CH:22]=[C:5]3[C@@H:4]1[CH2:24][CH2:25][CH3:26])[C:8]1[C:15]([O:16][CH3:17])=[C:14]([O:18][CH3:19])[CH:13]=[CH:12][C:9]=1[CH2:10]2)[CH3:2]74.3 g (211 mM) of (±)-(4R*,5aS*)-5-ethyl-4,5,5a,6-tetrahydro-9,10-dimethoxy-2-methyl-4-n-propyl-dibenz[cd,f]indole are dissolved in 600 ml acetone and a solution of 81.67 g (211 mM) of (-)-di-O,O'-p-toluoyl-L-tartaric acid monohydrate in 300 ml acetone is added with stirring. The mixture is further stirred for one hour at room temperature, a total of 1 liter ether being added in portions during this period. The resultant precipitate is filtered off, washed with ethyl acetate until it remains light yellow, and dried.
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